N-Doped TiO2 Nanoparticle Based Visible Light Photocatalyst by Modified Peroxide Sol−Gel Method

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• 作者：Tushar C. Jagadale ; Shrikant P. Takale ; Ravindra S. Sonawane ; Hrushikesh M. Joshi ; Shankar I. Patil ; Bharat B. Kale ; Satishchandra B. Ogale
• 刊名：Journal of Physical Chemistry C
• 出版年：2008
• 出版时间：September 18, 2008
• 年：2008
• 卷：112
• 期：37
• 页码：14595-14602
• 全文大小：375K
• 年卷期：v.112,no.37(September 18, 2008)
• ISSN：1932-7455

文摘

The peroxide gel route is employed to synthesize N-doped TiO₂ nanoparticles (NP) at low temperature using titanium tetraisopropoxide, ethylmethylamine, and hydrogen peroxide as precursors. Structural studies show anatase phase in the undoped titania NPs as well as at 5 at. % N-doped titania NPs, although with a degree of matrix disorder in the latter case. The annealing of N-doped titania NPs at different temperatures shows that above 400 °C nitrogen escapes the O−Ti−O matrix and at 500 °C the sample becomes crystalline. Transmission electron microscopy reveals that the particle size is in the range of 20−30 nm for the undoped TiO₂ but only 5−10 nm for N-doped TiO₂. At higher nitrogen concentration (10 at. %) bubble-like agglomerates form. FTIR and photoluminescence quenching also confirm the incorporation of nitrogen in anatase TiO₂. Optical properties reveal an extended tailing of the absorption edge toward the visible region upon nitrogen doping. X-ray photoelectron spectroscopy is used to examine the electronic state of doped nitrogen and the associated possible electronic modification of the TiO₂ matrix. Under visible light irradiation the undoped TiO₂ NPs do not show any significant photocatalytic activity, as expected; however, the 5 at. % N-doped TiO₂ NPs show excellent activity.